GRASSHOPPER is a visual programming editor which runs within Rhino3D. It is designed to automate and customize many of the modeling functions available within Rhino.

See:

www.grasshopper3d.com for resources and links.

www.rhino3d.com/download/grasshopper/1.0/wip to download the latest version of Grasshopper.

www.grasshopper3d.com/forum/categories/discussion-1/listForCategory for a discussion forum.